Steel buildings Singapore - Clarke Quay's green ventilation system This system uses heat differential to move air around, thus cooling the semi-enclosed shopping, bars, restaurant and walking area. The vast canopy shelters visitors from the both the sun and the tropical rain. The new 'green' low energy ventilation system lowers temperatures by up to 20 degrees. It is part of the 85 million Singapore dollar redevelopment around the Clarke Quay on Singapore River.